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From Discworld & Pratchett Wiki

Hastur is a Duke of Hell who becomes trapped in an answering machine. He later escapes when a telemarketer phones, and promptly devours the entire staff of the telemarketing office (unintentionally spreading a "wave of low-grade goodness" throughout the population). Hastur is generally accompanied by Ligur on his journeys to Roundworld.

Annotation

On Roundworld Hastur (The Unspeakable One, Him Who Is Not to be Named, Assatur, Xastur, or Kaiwan) is a fictional character in the Cthulhu Mythos. Hastur first appeared in Ambrose Bierce's short story Haïta the Shepherd (1893) as a benign god of shepherds.